Analytical aspects of the interval unilateral quadratic matrix equations and their united solution sets

This paper introduces the interval unilateral quadratic matrix equation, AX2 + BX + C = 0 and attempts to nd various analytical results on its AE-solution sets in which A;B and C are known real interval matrices, while X is an unknown matrix. These results are derived from a generalization of some results of Shary. We also give suficient conditions for non-emptiness of some quasi-solution sets, provided that A is regular. As the most common case, the united solution set has been studied and two direct methods for computing an outer estimation and an inner estimation of the united solution set of an interval unilateral quadratic matrix equation are proposed. The suggested techniques are based on nonlinear programming as well as sensitivity analysis.